Self-separating finishing and polishing machine



G. W. BALZ Jan. 15', 1963 5 Sheets-Sheet l INVENTOR. iU/VTf/ER M4 EALZ I AffakA/EY SELF-SEPARATING FINISHING AND POLISHING MACHINE Filed April 10, 1961 G. W. BALZ Jan. 15, 1963 3 Sheets-Sheet 2 'IIIIIIIIIIIIIIIIIIIII\I\II\A\\\\\\ lV/lmll, I.

1N VEN TOR. g'U/VTf/ER n! 5,442

G. W. BALZ Jan. 15, 1963 SELF-SEPARATING FINISHING AND POLISHING MACHINE Filed April 10, 1961 3 Sheets-Sheet 3 INVENTOR. gun/7H5? 144 BALZ ATTORNEY operation,

United 3,073,078 SELF-SEPARATING FINISHING AND POLISHING MACHINE This invention relates to finishing and polishing machines of the type in which-the parts to be finished or polished may be combined with finishing or polishing material, such as stone chips or the like, and then vibrated.

Heretofore, in such machines, there have been provided a hopper or tub to receive pieces to be finished and finishing or polishing material which when mixed together could not be separated, one material from another, without emptying the machine. This necessitated refilling of finishing and/ or polishing material for each batch of unfinished parts to be finished or polished. In such type of after each separating cycle is complete, the abrasive media is usually lifted by an overhead traveling crane in a hoist pan in which collected and recharged into the vibrating hopper or tub, at which time additional parts to be finished and/or polished and appropriate cleaning or other chemical compounds are also added as appropriate.

One of the objects of this invention is to provide a finishing and polishing machine which obviates the foregoing requirements.

Another object of this invention is to provide such a device which eliminates the necessity of having a container for storing the finishing and/ or polishing material, as well as maintaining a separator, as has been required with previous machines of this type for separating finished parts from said material.

An additional object of this invention is to provide such a device which allows discharge. of undesirable grit or waste as the finished parts are discharged and separated from the finishing and polishing material.

A further object of the invention is to provide such a device which eliminates the need for an extraneous separating device, hoist pan or other receptacle, and overhead traveling crane, and thus allows considerable saving in capital equipment outlay, labor and time.

A still further object of the invention is to provide such a device which may be readily adapted to an automatic cycle by interconnecting the various components of the device with time-controlled actuating units, for example, in such a manner as to provide timed charging of pieces to be finished or polished, finishing and/or polishing material and appropriate cleaning or other chemical compounds, timed discharge of finished and/or polished parts and waste separation, and return of utilizable finishing or polishing material to the hopper for reuse with additional parts, et cetera, andfinally, timed dumping of all of the contents of the hopper or tub in case such is desired as a part of the work cycle.

Still an additional object of the invention is to provide a finishing and polishing machine which readily lends itself to operation involving recirculation of parts to be finished or polished with a plurality of different cleaning or other chemical solutions.

Other objects and advantages of the invention will appear from the following specifications wherein preferred illustrative forms of the invention are shown and described, it being understood, however, that the instrumentalities there shown and described are merely illustrative and are not intended to limit the invention to the specific arrangements and organization described and shown.

atent ice In the drawings:

FIGURE 1 is a side elevation of a machine embodying the invention;

FIGURE 2 is a top view of the machine shown in FIGURE 1;

FIGURE 3 is a side elevational view in section showing the machine on section III-III of FIGURE 2;

FIGURE 4 is the same as FIGURE 3 showing the machine rotated counter-clockwise approximately ninety degrees;

FIGURE 5 is a partially broken elevational view of another form of the invention;

FIGURE 6 is a partially broken elevational view of the machine in FIGURE 5 rotated clockwise approximately one hundred'and ten degrees;

FIGURE 7 is a partially broken elevational view of the machine in FIGURE 5 rotated counter-clockwise approximately one hundred and ten degrees;

FIGURE 8 is a view of a vibrator employed in carry ing out the invention;

FIGURE 9 is a partially broken elevational view of another form of the invention;

FIGURE 10 is a side elevational view in section showing the machine of FIGURE 9 on section X-X; and

FIGURE 11 is a partially broken isometric view of another form of the invention.

The invention consists generally of a tub for receiving finishing and/or polishing material and parts to be finished. In preferred forms of the invention, the tub has a rounded semi-cylindrical bottom, and may be elongated and substantially enclosed. A vibratory motor, having its axis parallel to the axis of the bottom, e.g., the semicylindrical bottom, and carrying an eccentric Weight adapted to give rotary vibrations to the tub and its contents, is mounted directly to the tub in the preferred embodirnents of the invention. The means for effecting vibration'of the tube may take various forms, so long as it is operative to impart vibration to the tub in various positions of rotation, e.g., in both upright and tilted posi- .tions.

The sides of the tub are extended upwardly and in some instances preferably convergingly so as to form an opening for filling of refinishing and/ or polishing material and parts to be finished when in a first or abrading position. In this position the tub is substantially upright or vertical.

The tub with attached vibratory motor is mounted on a stationary frame for free movement in space by means of any suitable conventional vibration isolating mounts such as springs or rubber shock mounts and tiltable to a second, or discharge, position by any suitable tilting means. In said discharge position, the finishing and/or polishing material, and parts when finished, are caused to approach the opening of said tub by movement along the surface of one wall of the tub, which preferably constitutes an extension of the semi-cylindrical bottom, by the influence of the vibratory motor and the force of gravity. In discharge position, the said surface is preferably slightly inclined toward the tub opening to allow the force of gravity to exert its effect. In the absence of vibration, this incline must be approximately thirty-five degrees for parts and materials to move along a substantially flat wall surface, which precludes effective separation for all practical purposes but, with employment of normally available vibration imparting motors, separation is extremely efi'ective at an incline of only approximately three degrees from the horizontal toward the tub opening. When said incline is less than three degrees', the separation is accordingly less eflective, although some separation is possible even with the tub wall in a completely horizontal position with no angle of incline toward the tub opening.

. t '3 Theywall, preferably constituting one extension of the semi-cylindrical bottom, on which the finishing and polishing material and parts are influenced to move by vibration while the device is in discharge position, includes as apart thereof a first classification or-screen area comprising ascreen of a suitable mesh so as not to interrupt finished parts in'their movement toward the discharge openingfand yet allow passage therethrough of finishing and/or polishing material as Wellas the smaller waste produced by the abrading action. This first screenarea preferably extends from one side to the other of the -wall in which located, or-substantially so, so as toprovide minimum area on which parts or polishing and/ or finishing materials may lodge and pass by the screen area and thereby escape classification. A separating or classifying compartment so located with regard to the screena'rea as to receive the finishing and/ or polishing material and Waste which passes through said screen area in the tub Wall which preferably constitutes an extension of the semi-cylindrical bottom. The one side of said separating or classifying compartment consists of a second screen area in which is mounted a screen of a mesh suitable to allow only the waste to be passed. therethrough, while'retaining the finishing and/ or polishing material. This said second screen area, or sideof the separating compartment, is generally vertical when the device is in an abrading position, but generally horizontal in the discharge posiiton. It will be apparent that, when parts to be finished are smaller than the finishing and/or polishing materials, the finishing and/ or polishing materialscanbe caused to continue past ."the first classification area and out the discharge opening, or if desired into a second classification area and compartment, while finished parts pass through the screen and intothe firstmentioned separation compartment for exit orfor possible further classification. j

For a typical product being worked in the device, said first screen may have one inch openings, and said second screen may haveone-quarter inch openings. It is apparent,'however, that the mesh sizes of said screens is optional depending upon size of finished parts and finishing and/ or polishing materials as well as the relation of the size .of finished parts to. the size of finishing and/or polishing material, as well as the requirement of classification by passage therethrough of finishing and/or polishing material but exclusion of finished parts, or by .passage therethrough of finishedparts but exclusion of finishing and/or polishing material.

I A further side of the separating or classifying compartment, or portion of such side, may be inclined with regard to the tub wall to assist emptying of retained finishing or polishing material intothe tub when the entire device, as a unit, is tilted to or near the vertical loading or abrading position. In certain embodiments of the invention, such return to the tub is facilitated by including certain ducts, pipes, channels, or conduits, from the separating chamber bypassing the first screen area into the tub.

It is thus possible, by means of the present invention, to .sepaarte and discharge the finished parts and waste from the finishing and/or'polishing material in a simple and facile manner Without the removal of the finishing and/orpolishing material from the machine.

The specific embodiment of the invention shown in FIGURE l of the drawings consists of an elongated substantially enclosed tub I whichhas a semicylindrical motor, which axis in the preferred form of the invention extends parallel to the axis of the semi-cylindrical bottom of the tub and the axis of the pivoted mounting of the tub, which will hereinafter be described.

Tub 1, as viewed in elevation and cross section in FIGURES l and 3,respectively, has a vertically extending fiat wall portion 29 joining with the adjacent wall termination of the lower semi-cylindrical bottom 2, being an extension thereof. Wall portion 26' has an aperture formed therein adjacent its upper end to receive a separating or classifying screen 22 therein. Extending outwardly from the apertured portion carrying screen 22 is a separating chamber 23 having its upper and lower sidesas there viewed defined by converging walls 26 and 27 (outwardly extending from wall 2%). The outer end of separatingchamher 23 has a second classifying screen 24 mounted therein and extending generally parallel to first classifying screen 22. Still referring to FIGURES l and 3 it will be noted that oppositely positioned to wall portion 20 is a convex wall portion 28 joining with the other upper edge of semi-cylindrical bottom 2, of which it is an extension, and extending in generally converging attitude toward opposite wall portion 20. integrally formed at the upper end of the opposite wall portion 23 is a flat and converging portion 28' which, with the upper end 20', forms two oppositely positioned walls of the filling and part emptying opening 3. To complete the tube 1 there are oppositely positioned tub end plates 29 and 3t so best seen in'FIGURE 2.

FIGURE 2 shows the tub mounted for substantial free movement in space by side plates 6 secured to tub I by rubber vibration isolating mounts 7 which permit such free movement in space. The side plates 6 have spindles or supporting shafts 8 and 9 rigidly secured thereon for purposes of tilting the machine for certain emptying and reloading. Spindles 8 and 9 are assembled in bearings 10, which are mounted on a suitable stationary frame 11, for free rotating movement of tub 1, efiected by any suitable tilting device through a rod such as 13 secured to crank 14 mounted on spindle 8. In FIGURES l and 2, the tilting device is a wheel 15 having aneccentrically located pin 16 for receiving the end of rod 13. A timing motor not shown rotates Wheel 15 on shaft 17 of the motor.

causing pin 16 to pull or push rod 13 which efiects crank approximately ninety degrees difference.

InFIGURE 3 the machine is shown ina relatively up right abrading position with parts 18 to be finished combined with finishing and/or polishing material 19 and confined in tub I by virtue of its upright position. The vibratory motor 4 is imparting the Working action in the tub 1 and its contents, said working action being of the nature of rotation about-the axis of the semi-cylindrical tub bottom 2.

FIGURE 4 shows tub 1 in tilted discharge position in which contents move toward a point 20A in wall 20 where begins separation of finished parts '18 from finishing and polishing material 19 and waste 21 by means of classifying screen 22. Parts 18' continue on to be discharged through opening 3. Finishing and polishing material 19 and Waste 21 are directed into separating chamber 23 which has a second classifying screen 24 mounted over opening 25 for the purpose of confining the finish and/ or polishing material 19.

In FIGURE 5 another form of the invention is shown in an upright abrading or loading position; Parts to be finished 118 and finishing and/or polishing material 119 are shown at bottom 102 of tub 101, having been charged through opening 103 and being unable to lodge in compartment 123 by virtue ofits inclined side 124.

FIGURE 6 shows tub 101 in a dumping position rotated clockwise, about its axis 108, a sufiicient angle to discharge all the contents thereof, including the combina tion of finished or unfinished parts 118, finishing and/ or polishing material 119 and waste 121.

FIGURE 7 shows tub 101 in discharge or separating 5 position, comparable to that shown in FIGURE 4, rtated counter-clockwise, about the axis 108, a sufficient angle to separate and discharge finished parts 118, waste 121 and retain finishing and/ or polishing material 119.

FIGURE 8, illustrating a preferred form of the invention, shows tub I with vibratory motor 4 directly mounted thereon, to be supported therewith as a unit by the vibration isolating mounts. This vibratory motor consists, as further shown in FIGURE 8, of a rotor 98 carrying an eccentric weight 5. The eccentric weight 5 is mounted between the bearings 99, but it will be understood that it might be outboard of the bearings. The rotor is mounted with its axis 100 extending generally parallel to the axis of the tub I so that the rotary vibrations imparted by the motor to the tub and its contents tend to impart a rotary or orbital motion to the contents of the tub around a generally horizontally extending axis, causing said contents to rotate generally about the axis of the tub.

In FIGURE 9 another form of the invention is shown in an upright abrading position. Tub 201 is mounted for substantially free movement in space by providing flanged side'drums 206 rigidly'adjoined to tub sides 229 and 230. In sidedrums206 are provided a plurality of adjusting screws 232 equally spaced about the circumference of the drums 206. Each of said screws 232carries a locking device in the form of a jam nut 233 and, at one end of each of said screws, a spring clamp 234 so mounted to said screw 232 as to be rotatable about the axis of the screw. Spring clamps 234 are rigidly secured to one end of springs 207. Opposite ends of said springs are rigidly secured and equally spaced circumferentially on shaft collars 235 so that springs 207 are caused to be radially mounted and adjustably under compression. Shaft collars 235, are shown secured to a through shaft 208, instead of the more conventional spindles, by means of set screws 236. Shaft 208 extends through openings 237, as

seen in FIGURE 10, in both sides 229 and 230 of tub 201 and is mounted in bearings 210 which are in turn mounted on stationary frame members 211.

FIGURE 10 shows tub 201 having a vertically extending flat wall portion 220 joining with the adjacent wall termination of the lower semi-cylindrical bottom 202, being an extension thereof. Wall portion 220 has an aperture formed therein adjacent its upper end to receive a separating screen 222 therein. Extending outwardly from the aperture portion'of wall 220 which carries screen 222 is a separating compartment 223 having its outer sides defined by curved walls 226 and 227 (outwardly extending from wall 220). A portion of side 227, at the point of contact with screen 222, is abruptly turned upward to form a discharge surface 203 which constitutes an extension of screen 222 and wall 220. It will be noted that elliptically shaped sides 229 and 230 (see FIGURE 9) form oppositely positioned end plates for both separating compartment 223 and tub 201. An upwardly extended portion 228 of semi-cylindrical bottom 202 of tub 201 terminates a substantial distance from discharge surface 203 to form an opening 238 through which parts and finishing and/or polishing materials may be introduced into tube 201.

FIGURE 11 shows another form of the invention in a discharge position rotated a suflicient angle to discharge all contents of tub 301, in which is provided one side wall 320 which extends externally of the tub 301, said extensions being in the form of separating and classifying screen 322. Guide rails 342 at the sides of the screen 322 converge toward opening 336 which is enclosed by chute 337 extending downwardly through a solid deck 338 and into separating compartment 323. Deck 338 is substantially parallel to but may be angled slightly from screen 322. Deck end 339, of deck 338, extends through opening340 in compartment 323 to constitute a discharge trough. Chutes 341 extend through and to a point above screen 322 but are flush with underside of deck 338. A

19 through opening 3 while tub I is in an upright or abrading position. Vibratory motor 4 and its vibrating eccentric weight 5 are energized. This imparts a rotary vibratory motion to the contents of the tub 1, which move orbitally in a continuous path generally following the contour of the bottom of the tub.

After the pieces 18 have been finished, the machine is tilted to approximately ninety degrees from its upright or abrading position by some desirable means effecting tub I and allowed to empty along one extended wall 20 of tub I by the influence of the vibratory motor and the force of gravity.

After the discharging of finished parts 18 and waste 21 from the machine, through openings 3 and 25 respectively, and their collection in separate suitable containers, and the confining of the finishing and/or polishing material within the machine, the machine is returned to the abrading position. The confined finishing and/ or polishing material returns through classifying screen 22 to tub 1 and anothercycle of operation is in order.

For total content discharge or dumping, the machine is merely tilted clockwise from its abrading or discharge position to itsdumping position and all contents discharged through the influence of vibration and the force of gravity, as shown in FIGURE 6. Obviously, discharge and dumping positions-may be readily reversed byoptional construction of the device.

. In a typical operation of one version of the device of the present invention when parts to be finished are smaller than the finishing and/ or polishing material, the parts to be finished are charged into tub 301, shown in FIGURE 11, together with finishing and/or polishing materials while tub 301 is in an upright abrading position.

After the pieces have been finished, resulting from the abrasive action as effected by the abrasive materials in tub 301 under the influence of vibratory motor 304, the

machine is tilted approximately ninety degrees from its upright or abrading. position by some desirable tilting means elfecting tub 301 and allowed to empty along one extended wall 320 of tub 301, still under the influence of the vibratory motor 304 and preferably under the further influence of gravity.

Upon reaching the surface of screen 322, the finished parts are allowed to pass through screen 322 by virtue of their size, thus dropping onto solid deck 338 and being discharged from the machine into a suitable receptacle. Finishing and/ or polishing materials, by virtue of their size, are excluded from passage through screen 322 and enter separating compartment 323 by means of dust or chute 337 and its opening 336.

Finishing and/ or polishing materials remain in separating compartment 323 untiltub 301is returned to its up right abrading position, at which time said materials are allowed passage through ducts or chutes 341 which direct said materials for return to this 301 and commencement of another work cycle.

It is thus seen that a novel apparatus is here provided for carrying out economically and in an easy manner within one machine an abrading operation which is readily followed by, firstly, the separation of the worked articles from the abrading material and, secondly, retention and repositioning of the abrading material for reuse and, thirdly, separation of the waste material abraded from the abrading material, and whereby all of the other objects of the invention hereinbefore set forth are accomplished.

It will be apparent that the present invention may be embodied in other specific forms without departing from the spirit or essentialattributes thereof.

I and not restrictive, reference being had to the appended claims rather than the foregoing description to indicate the scope of the invention, in which appended claims polishing material is to be understood as being one species of finishing material and polishing is to be understood as being one species of ""fiinishingf 1. A self-separating finishing device comprising in combination a tub having a bottom and side walls and at least one opening therein, said tub being supported for sub stantial free movement in space and having an abrading position. and a discharge position and being tiltably mounted for rotation from one position to another, said tub being adapted to receive parts to be finished and finishing material when in one position of rotation and to discharge contents thereof when in said discharge position of rotation; a screen attached to said tub and rotatable with said tub whereby one of said finished parts and finishing material is separated from the other by passage through said screen while the other is retained on said screen when said tub'is in a "discharge position, said screen having a mesh selected to exclude passage therethrough of finishedparts and allow passage therethrough of finishing material, said screen cooperating with an opening ,in said tub whereby finishing material passes through said screen while, finished parts are retained on said screen and pass through said opening in said tub, a chamber cooperating with said screenfor collection of finishing material which passes through said screen, means for returnof finishing materialc'ollected in said chamber to-said tub, and vibratory means operative to'impart a vibratory motion to, said tub in various positions of rotation.

2. A self-separating finishing device comprising in combination a tub having a bottom and side walls and at least one opening therein, said tub being supported for substantial free movement in space and having an abradmg position anda discharge position and being tiltably' mounted for rotation from one position to another, said on "said, screen when saidtub is in a discharge position,

said screen having a mesh selected to exclude passage beingadapted to receive parts to be finished and finlshmg material when in one positionof rotation and to therethrough of finished parts and allow passage therethrough of finishing material, said screen cooperating with an opening insaid tub whereby finishing material passes through said screen while finished parts are retained on said screen and pass through said opening in said tub, said screen" being generally inclined toward said opening in said tub when said tub is in a discharge position of rota- I tion, a chamber and return means attached to said tub and cooperating with said screen for collection and return of, finishing material passing through said screen to said tub, and .vibratory means operative to impart a vibratory, motion tosaidtubin various positions of rotation.

'3. A self-separating finishing device comprising in combination a tub having a bottom and side walls and at least one opening therein, said tub being supported for substantialfree movement in space and having an abrad I I Dig posit on and a discharge position and-being mounted for rotation from one position to another, said tub being adapted to receive parts to be finished and finishing material when in one position of rotation and to discharge contents thereof through an opening therein when in said discharge position of rotation, a screen attached to said tub and rotatable with said tub whereby one of said finished parts andifinishingmaterial is separated from the 7 other by passage through said screen while the other is retained on said screen when said tub is in a discharge position, said screen having a mesh selected to allow a passage therethrough of finished parts and exclude pas sage therethrough of finishing material, 'a collection chambersfor collection of finishing material which does not pass through said screen attached to said tub and rotatable therewith, duct means communicating between said chamber and said tub and bypassing said screen for return of finishing material to said tub, exit means for exit from said device of finished parts which pass through said screen, and vibratory means operative to impart a vibratory motion to saidtub in various positions of rotation.

' 4.- The device of claim 3, wherein said exit means is a solid deck mounted generally parallel to said screen and located so as to be generally beneath said screen when said tub is in discharge position of rotation.

5. A'self-s'eparating finishing machine, comprising in combination a tub having an opening therein and a semicylindrical bottom and side walls, said tub being adapted to receive finishing material and parts to be finished, said tub having an abrading position and a discharge position and being tiltable from said abrading position to said discharge position and mounted for substantial free movement in space in both of said positions, a vibratory motor mounted to said tub for imparting vibrations to said tub and its contents in both said positions, a screen attached to said tub and rotatable with said tub, said screen being of a mesh selected to permit passage therethrough of finished parts but to exclude passage therethrough of finishing material, said screen being provided with guide rails .for channeling classified finishing material along the surface of said screen, a passageway at the end of the channel defined by said guide rails, a compartment communicating with said passageway and attached to said tub for receiving finishing material which is retained by said screen, a duct bypassing said screen, said compartment being in communication with said tub by means of said duct, whereby finishing material retained in said compartment is returned to said tub when said tub is returned to abrading position.

6. A self-separating finishing device comprising in combination a tub having a semi-cylindrical bottom and adapted to receive finishing material and parts to be finished, a vibratory motor mounted on said tub and adapted to impart vibrations to said tub and contents thereof, said tub and vibratory motor being supported as a unit for substantial free movement in space, said tub having an abrading position in which said semicylindrical bottom is. in its normal position and a sec- 0nd or discharge position in which said bottom is rotated from its normal position, said tub being mounted for rotation from its abrading position to its discharge position, a first screen of a mesh selected to exclude passage therethrough of finishing material but to permit passage of finished parts attached to said tub and rotatable there with, said first screen being provided with guide rails defining a'channel for passage of finishing material of a size excluded from passage through said screen along the surface of said screen, a chamber attached to said tub, a first duct constituting the terminus of said channel in communication with said chamber, a second screen of mesh selected to allow passage therethrough of waste but to exclude passage therethrough of finishing material embodied in said chamber, a second duct bypassing said first screen, said chamber communicating with said tub by said second duct, whereby finishing material retained in said chamber is returned to said tub when said tub is returned to abrading position.

7. A self-separating finishing device provided with a parts discharge opening comprising a tub adapted to receive finishing material-and parts to be finished, said tub being supported for substantial free movement in space and having an abrading position and a discharge position and being tiltable from one position to the other and to another, said adapted to discharge finished parts when in discharge position, separating means attacl edto said tub and coperating with said parts discharge Opening for separation of finished parts from finishing material and exit of finshed parts when said tub is in discharge position, means attached to said tub for collection of separated finishing material, and vibratory means for imparting a vibratory motion to said tub.

8. The device of claim 7, including means attached to said tub for return of said finishingmaterial to saidtub upon return of said tub'to abrading position.

9. A self-separating finishing device comprisinng a tub supported for substantial free movement in space and having an abrading position and a discharge position and being mounted for rotation from one position to another, said tub being adapted to receive parts to be finished and finishing material when in one position of rotation and to discharge contents when in said discharge position of rotation, a parts exit for exit of parts from said device, means rotatable with said tub and-cooperating with said parts exit for separation of finished parts from finishing material and concurrent exit of finished parts, means rotatable with said tub for retention of separated finishing material in said device, means rotatable with said tub for return of said retained finishing material to said tub, and vibratory means operative to impart a vibratory motion to said tub.

10. A self-separating finishing device comprising a tub having a bottom and side walls and at least one opening therein, said tub being supported for substantial free movement in space and having an abrading position and a discharge position and being tiltable from one position to another, said tub being adapted to receive parts to be finished and finishing material when in one position and to discharge contents thereof when in said discharge poit) rotation and to discharge contents thereof through at least one opening therein when in said discharge position of rotation, exit means for exit of parts, a screen at tached to said tub and rotatable with said tub whereby one of said finished parts and finishing material is separated from the other by passage through said screen while the other is retained on said screen when said tub is in a discharge position, said screen cooperating with said sition, a foraminous member attached to saidtub for separation of said finished parts and finishing material by passage of one through said member and retention of the other by said member, a chamber cooperating with said member for collection of said finishing material, a duct which bypasses said member for return of finishing material collected in said chamber to said tub, a parts exit for discharge of finished parts, and vibratory means operative to impart a vibratory motion to said tub.

11. A self-separating finishing device comprising in combination a tub having a bottom and side walls and at least one opening'therein, said tub being supported for substantial free movement in space and having an abrading position and a discharge position andbeing mounted for rotation from one position to another, said tub being adapted to receive parts to be finished and finishing material when in one position ofv rotation and to discharge contents thereof when in said discharge position of rotation, a screen attached to said'tub and rotatable with said. tub whereby one of said finished parts and finishing material is separated from the other by passage throughsaid screen while the other is retained on said screen, a parts exit for discharge of finished parts, means attached to and rotatable with said'tube and bypassing said screen for collection and return of said finishing material to said tub uponreturn of saidtub to abrading position, and vibratory means attached to said tub for imparting a vibratorymotion thereto; I

12. A self-separating finishing. device comprising in combination a tub having a semi-cylindrical bottom and side walls and at least one opening therein, said tub being supported for substantial free movement in space- I and having an abrading position jand'ia discharge posi tion and being mounted. for rotationffrom one position tub being adaptedto receive parts-to be finished and finishing material when in one position of tation from an exit means for exit of finished parts, a chamber cooperating with said screen for collection of said finishing material separated from said finished parts, a duct which bypasses said screen for return of said finishing material collected in said chamber to said tub upon return of said tub to abrading position, and a vibratory motor mounted to said tub forv imparting a vibratory motion to said tub in various positions of rotation.

13. A housing for a vibratory finishing machine comprising a tub adapted to be resiliently mounted for roabrading position to a discharge position and adapted to be loaded with finishing material and parts to be finished, a' chamber communicating with said tub, a foraminous member interposed between said tub and said chamber for separating finishing material from parts, and a parts exit for exit of parts from said housing, said foraminous member cooperating with said parts exit for discharge of parts from said housing when said housing is mounted and rotated to a discharge position.

14. The housing of claim 13, including means for return offinishing material collected in said chamber to said tub. I

15. The housing of claim 14, wherein the means for return of finishing material to the tub lay-passes said foraminous member.

16. A vibratory finishing machine comprising a housing having a tub adapted to be loaded with finishing material and parts to be finished, said housing being resiliently mounted and tiltable from an abrading position to a discharge position, a chamber communicating with said tub, a toraminous member interposed between said tub and saidchamber for separating finishing material with said parts for tilting said housing to the discharge position and to the 'abrading position, and vibratory means operative to impart a vibratory motion to said tub. i

References (Iitedin the file of thispatent UNITED STATES PATENTS 228,803 Benson June 15, 1880 965,813 Greist July 26, 1910 7 1,048,026 Bates et a1 Dec. 24, 1912 2,118,227 Ransohoir" May 21, 1938 2,138,550, MacLellam Nov. 29, 1938 2,143,610 Muller et a1. Jan. 10, 1939 2,290,036. Davis July 14, 1942 2,319,391 Davis May 18,1943 2,332,701 Dowsett Oct. 26, 1943 2,359,944 Schummer Oct. 10, ,1944 2,519,060 Manley Aug. 15,1950 2,739,427 Ransohofi Mar. 27, 1956 2,831,576 Webner. Apr. 22, 1958 1 2,843,979 .Lupo July 22, 1958 2,918,926 9 Behnke Dec. 29, 1959 2,933,861 Bintzler Apr. 26,- 1960 2,973,606 Brandt Mar/7,1961 $2,997,813 j Brandt -Aug..29, 1961 2,997,814 Brandt 'f.. Aug, 29, 1961 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 3 O73,078 January 15, 1963 Gunther We Balz It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 37, for "tube" read tub line lf? for refinishing" read finishing column 3, line 28,- for "'posiiton" read position line 60, for "sepaarte" read separate column 4, line 24, for "tube" read tub line 25, for "so" read as line 69, for "124-" read 126 column 5, line 60, for "tube" read tub lines 64 and 65 for "extensions" read extension column 6, line 55, for "dust" read duct column 7, line 8, for 'fiinishing read "finishing" column 9 line 12, for "comprisinng" read comprising line 59 for "tube read tub column 10 line 55 for "May 21 1938" read May 24, 1938 -B Signed and sealed this 20th day of August 1963,

(SEAL) Attest:

ERNEST W. SWIDER DAVID L. LADD Attesting Officer Commissioner of Patents 

13. A HOUSING FOR A VIBRATORY FINISHING MACHINE COMPRISING A TUB ADAPTED TO BE RESILIENTLY MOUNTED FOR ROTATION FROM AN ABRADING POSITION TO A DISCHARGE POSITION AND ADAPTED TO BE LOADED WITH FINISHING MATERIAL AND PARTS TO BE FINISHED, A CHAMBER COMMUNICATING WITH SAID TUB, A FORAMINOUS MEMBER INTERPOSED BETWEEN SAID TUB AND SAID CHAMBER FOR SEPARATING FINISHING MATERIAL FROM PARTS, AND A PARTS EXIT FOR EXIT OF PARTS FROM SAID HOUSING, SAID FORAMINOUS MEMBER COOPERATING WITH SAID PARTS EXIT FOR DISCHARGE OF PARTS FROM SAID HOUSING WHEN SAID HOUSING IS MOUNTED AND ROTATED TO A DISCHARGE POSITION. 